Key chain



FIG. 1 is a perspective view of a key chain showing my new design;

FIG. 2 is a top plan view, the opposite side view being identical;

FIG. 3 is a front elevational view, the opposite side view being identical;

FIG. 4 is a right side elevational view, the left side view being identical. 

The ornamental design for a key chain as shown and described. 